SYNTHESIS AND CRYSTAL STRUCTURES OF DIMERIC SCHIFF BASE OXOVANADIUM(V) COMPLEXES WITH ANTIMICROBIAL ACTIVITY

摘要

Two new dimeric oxovanadium(V) complexes, [VO_2L~1]_2 · 2H_2O (I) and [VO_2L~2]_2 (II), where L~1 and L~2 are the monoanionic form of 5-methoxy-2-[(2-methylaminoethylimino)methyl]phenol (HL~1) and 5-diethyl-amino-2-[(2-methylaminoethylimino)methyl]phenol (HL~2), respectively, have been synthesized and characterized by elemental analysis, FT-IR spectra, and single crystal X-ray determination. The crystal of I is monoclinic: space group P2_1, a=6.858(2), b=16.630(3), c=12.306(2) ?, =103.985(2)°, V=1361.9(5) ?~3, Z=2. The crystal of II is triclinic: space group Pī, a=7.378(2), b=8.838(2), c=13.312(3) ?, α=102.576(2)°, β=92.044(2)°, γ=113.017(2)°, V=772.7(3) ?~3, Z=2. The V···V distances are 3.140(1) ? in I and 3.254(1) ? in II. The V atoms in the complexes are in octahedral coordination. The effect of the complexes on the antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans was studied.